Please consider us poor color blind men when you select colors for the game. Red / Green color blindness is VERY common. So that means the purple and blue are indistinguishable, as are the red and green, and the gold/orange ain't far behind.

Yes, yes, the last few times I mentioned this I was advised to put dots or marks on the counters etc. But, with all the love and fine graphic flair you pour into the games why then make it necessary for what must be a pretty significant number of your players to mar them with such graffiti?